21233320233 has 4 divisors (see below), whose sum is σ = 28311093648. Its totient is φ = 14155546820.

The previous prime is 21233320223. The next prime is 21233320247. The reversal of 21233320233 is 33202333212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21233320233 - 2¹⁶ = 21233254697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21233320223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3538886703 + ... + 3538886708.

It is an arithmetic number, because the mean of its divisors is an integer number (7077773412).

Almost surely, 2^21233320233 is an apocalyptic number.

It is an amenable number.

21233320233 is a deficient number, since it is larger than the sum of its proper divisors (7077773415).

21233320233 is an equidigital number, since it uses as much as digits as its factorization.

21233320233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7077773414.

The product of its (nonzero) digits is 3888, while the sum is 24.

Adding to 21233320233 its reverse (33202333212), we get a palindrome (54435653445).

The spelling of 21233320233 in words is "twenty-one billion, two hundred thirty-three million, three hundred twenty thousand, two hundred thirty-three".